CN112178186B - Doctor blade ring, three-combination piston oil ring and preparation method of doctor blade ring - Google Patents
Doctor blade ring, three-combination piston oil ring and preparation method of doctor blade ring Download PDFInfo
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- CN112178186B CN112178186B CN202010995854.3A CN202010995854A CN112178186B CN 112178186 B CN112178186 B CN 112178186B CN 202010995854 A CN202010995854 A CN 202010995854A CN 112178186 B CN112178186 B CN 112178186B
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- doctor blade
- circular arc
- blade ring
- scraper
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- 238000002360 preparation method Methods 0.000 title abstract description 6
- 230000007704 transition Effects 0.000 claims abstract description 40
- 239000011159 matrix material Substances 0.000 claims abstract description 6
- 238000007790 scraping Methods 0.000 claims description 30
- 238000000576 coating method Methods 0.000 claims description 17
- 239000011248 coating agent Substances 0.000 claims description 14
- 238000000227 grinding Methods 0.000 claims description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 6
- 238000005498 polishing Methods 0.000 claims description 6
- 239000010959 steel Substances 0.000 claims description 6
- 238000005096 rolling process Methods 0.000 claims description 5
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 claims description 4
- 239000000919 ceramic Substances 0.000 claims description 4
- 229910052804 chromium Inorganic materials 0.000 claims description 4
- 239000011651 chromium Substances 0.000 claims description 4
- 238000004381 surface treatment Methods 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 3
- 150000004767 nitrides Chemical class 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 238000004804 winding Methods 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 claims description 2
- 239000003921 oil Substances 0.000 description 43
- 230000000052 comparative effect Effects 0.000 description 8
- 238000005299 abrasion Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 238000000137 annealing Methods 0.000 description 4
- 238000009826 distribution Methods 0.000 description 4
- 230000001976 improved effect Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 208000031251 Ear abrasion Diseases 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 238000005121 nitriding Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000008093 supporting effect Effects 0.000 description 1
- 238000005496 tempering Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- 238000005491 wire drawing Methods 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
- F16J9/12—Details
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
- B21F—WORKING OR PROCESSING OF METAL WIRE
- B21F37/00—Manufacture of rings from wire
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J9/00—Piston-rings, e.g. non-metallic piston-rings, seats therefor; Ring sealings of similar construction
- F16J9/12—Details
- F16J9/20—Rings with special cross-section; Oil-scraping rings
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Pistons, Piston Rings, And Cylinders (AREA)
Abstract
The invention discloses a doctor blade ring, a three-combination piston oil ring and a preparation method of the doctor blade ring, which comprises a doctor blade ring matrix with the upper surface and the lower surface parallel to each other; the annular inner side of the scraper ring base body extends to form an inner circular arc, and the radius of the inner circular arc is R1; an outer circular arc extends from the annular outer side of the scraper ring base body, the radius of the outer circular arc is R2, and the arc width of the outer circular arc is t 1; the outer circular arc is connected with the upper surface and the lower surface of the scraper ring base body through transition inclined planes, the length of the upper transition inclined plane connected with the upper surface is L1, and the length of the lower transition inclined plane connected with the lower surface is L2; the wiper blade has the following relations that R1 is 0.7H-0.9H, R2 is 0.25H-0.4H, t1 is 0.6R 2-0.8R 2, and L1 is 0.45H-0.65H, L2 is 0.3H-0.4H, wherein H is the height of the wiper blade ring body, and the value of H is in the range of 0.3 mm-0.5 mm.
Description
Technical Field
The invention relates to the field of piston rings, in particular to a doctor blade ring, a three-combination piston oil ring and a preparation method of the doctor blade ring.
Background
The oil ring is used as a core oil control component of the engine, and the performance of the oil ring directly influences the oil consumption of the automobile engine. The three-combination oil ring has the characteristics of excellent side surface sealing performance, thin design and the like, and is more adopted, so that the three-combination oil ring becomes mainstream design particularly on high-speed machines such as gasoline engines, gas machines and the like.
The three-combination piston ring oil ring consists of an upper scraping ring, a lower scraping ring and a middle lining ring, and outward tension is provided for the scraping rings through the middle lining ring, so that the excircle of the scraping rings is always kept in high fit with the cylinder wall, and the function of scraping oil on the cylinder wall is achieved during up-and-down motion. The oil ring moves up and down along with the reciprocation of the piston, the inner circular surface of the scraper ring is fully contacted with the ear supporting part of the backing ring all the time to form a friction pair, and the outer circular surface of the scraper forms a friction pair with the cylinder wall. The prior scraper ring is an approximately elliptical structure consisting of a rectangle and two semicircles. With the rising of the explosion pressure of the automobile and the rising of the friction requirement, the wiper blade ring has the following defects: (1) the inner circle surface of the scraper ring is always in friction with the ear part of the lining ring, so that the ear part of the lining ring is excessively worn, and after the ear part of the lining ring is worn, the combined tension of the ring is reduced, so that the oil scraping effect is influenced; (2) the outer circle surface of the scraping blade is in a common semicircle shape, so that the barrel surface degree is small, the contact area between the outer circle surface of the scraping blade and the cylinder wall is wide, and in order to ensure the contact surface pressure between the scraping blade ring and the cylinder wall, the tension of an oil ring must be increased, so that the friction work loss of an engine is increased, and the fuel consumption of the engine is not improved. In patent CN211275935U, an asymmetric wire for R-arc doctor blade piston ring is disclosed, the inner circular surface of the doctor blade ring made of the wire in this patent is half circular arc as a common doctor blade ring, which does not solve the ear abrasion problem of the doctor blade ring to the liner ring, the improvement of the outer circular surface reduces the contact bandwidth between the doctor blade ring and the cylinder wall to a certain extent, and reduces the friction force between the doctor blade and the cylinder sleeve, but there is also a negative factor, because the upper and lower parts of the outer circular surface of the doctor blade ring are of a symmetrical structure, when the doctor blade ring moves up in the cylinder sleeve, the oil storage space at the oil distribution side is small, the oil distribution amount is insufficient, the oil film thickness of the doctor blade ring distributing oil on the cylinder wall is thinner, which causes unsmooth lubrication between the ring and the cylinder wall, dry friction easily occurs, the outer circular abrasion of the doctor blade ring is fast, the service life of the doctor blade ring is poor, in addition, the engine noise caused by dry friction is large, and the comfort of drivers and passengers is affected.
Disclosure of Invention
The invention aims to provide a scraper ring, a three-combination piston oil ring and a scraper ring preparation method, so as to solve the problems in the background technology.
In order to achieve the purpose, the invention provides the following technical scheme:
a doctor blade ring, comprising: the upper surface and the lower surface of the scraper ring base body are parallel to each other; the annular inner side of the scraper ring base body extends to form an inner circular arc, and the radius of the inner circular arc is R1; an outer circular arc extends from the annular outer side of the scraper ring base body, the radius of the outer circular arc is R2, and the arc width of the outer circular arc is t 1; the outer circular arc is connected with the upper surface and the lower surface of the scraper ring base body through transition inclined planes, the length of the upper transition inclined plane connected with the upper surface is L1, and the length of the lower transition inclined plane connected with the lower surface is L2; has the following relation:
R1＝0.7H～0.9H
R2＝0.25H～0.4H
t1＝0.6R2～0.8R2
L1＝0.45H～0.65H
L2＝0.3H～0.4H
wherein H is the height of the scraping ring matrix, and the value range of H is 0.3 mm-0.5 mm.
As a further scheme of the invention: the sum of the widths of the scraping ring matrix and the arcs of the inner circular surface and the outer circular surface is T, and the range of T is 1.4 mm-3.8 mm.
As a further scheme of the invention: the inner circular arc is connected with the upper bottom edge and the lower bottom edge of the scraper ring base body through transition circular arc surfaces, and the radius of each transition circular arc surface is 0.05-0.015 mm.
As a further scheme of the invention: the included angle between the upper transition inclined plane and the upper surface is theta 1, the included angle between the lower transition inclined plane and the lower surface is theta 2, and the value ranges of the theta 1 and the theta 2 are 30-45 degrees.
As a further scheme of the invention: and wear-resistant coatings are arranged on the circular arc of the outer circular surface and the surface of the transition inclined plane.
As a further scheme of the invention: the wear-resistant coating is one or a combination of a nitride layer, a chromium coating, a ceramic composite coating and a diamond-like coating.
A three-combination piston oil ring, comprising: the scraper ring is arranged on the upper surface and the lower surface of the lining ring.
A method of making a doctor blade ring according to any of the preceding claims, comprising the steps of:
s1: performing surface treatment on the round steel wire and then drawing the diameter of the steel wire;
s2: rolling the drawn round wire into a flat wire according to the size of the doctor blade ring to be produced;
s3: roughly processing the inner circle and the outer circle of the flat wire, and extruding the flat wire into an inner circular arc and an outer circular arc by using a pair of rollers;
s4: drawing and correcting the flat wires with arc inner and outer circular surfaces and an inner hole die of a finished product of the scraper ring wire rod to obtain the wire rod of the scraper ring;
s5: rounding the piston ring by a ring winding machine according to the nominal diameter of the piston ring, and polishing and grinding the outer circle surface to enable the roughness Rz1.5 to be within;
s6: after removing oil stains and impurities on the surface of the scraping sheet, cutting off the scraping sheet ring which is encircled by the encircling machine, and polishing and grinding the surface of the outer circle to enable the roughness Rz1.0 of the outer circle surface to obtain a finished product of the scraping sheet ring.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, the contact surface between the circular arc of the inner circular surface of the scraper ring and the lining ring is increased, so that the contact surface pressure is reduced, and the abrasion of the lining ring is effectively improved; by reducing the circular arc of the outer circular surface of the scraper ring, the contact surface between the ring and the cylinder wall is reduced, the contact surface pressure is increased, the oil scraping effect of the scraper ring is improved, and the scraper ring has a positive effect on improving the oil consumption of an engine. In addition, the lower transition inclined surface (or called chamfer surface) of the outer circular surface of the scraper ring is small, and the upper transition inclined surface (or called chamfer surface) of the outer circular surface is long, so that the working circular arc surface of the scraper ring is deviated downwards, the oil distribution area on the cylinder wall is increased when the scraper ring moves upwards, the oil storage capacity is increased, the oil film thickness on the cylinder wall is increased, the lubricating condition is improved, the frictional wear between the ring and the cylinder wall is reduced, the friction surface between the ring and the cylinder sleeve is protected, and the frictional noise is reduced. When the scraper moves downwards, the oil distribution area is small, so that the thickness of the oil film on the surface of the cylinder sleeve is reduced, the residual lubricating oil is reduced, and the oil consumption of the engine is further reduced.
Drawings
FIG. 1 is a schematic size view of a doctor blade ring;
FIG. 2 is a top view of the doctor blade ring;
FIG. 3 is a schematic cross-sectional view of FIG. 2A-A;
FIG. 4 is a cross-sectional schematic view of a blade ring wire;
FIG. 5 is a schematic cross-sectional view of a conventional oil ring scraper ring;
FIG. 6 is a schematic view of the assembly of the scraper ring.
In the figure: 1-scraping ring matrix, 2-inner circular arc, 3-outer circular arc, 4-upper transition inclined plane, 5-lower transition inclined plane, 6-upper horizontal plane, 7-lower horizontal plane, 8-inner circular plane, 9-outer circular plane, 10-upper inclined plane, 11-lower inclined plane, 12-inner circular side, 13-outer circular side, 14-backing ring, 15-scraping ring, 16-piston, 17-cylinder sleeve.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Referring to fig. 1-3, in an embodiment of the present invention, a blade ring includes a blade ring body 1 having upper and lower surfaces parallel to each other; an inner circular arc 2 extends from the annular inner side of the scraper ring base body 1, and the radius of the inner circular arc is R1; an outer circular arc 3 extends from the annular outer side of the scraper ring base body 1, the radius of the outer circular arc 3 is R2, and the arc width of the outer circular arc 3 is t 1; the outer circular arc 3 is connected with the upper surface and the lower surface of the scraper ring base body 1 through transition inclined planes, the length of an upper transition inclined plane 4 connected with the upper surface is L1, and the length of a lower transition inclined plane 5 connected with the lower surface is L2; has the following relation:
R1＝0.7H～0.9H
R2＝0.25H～0.4H
t1＝0.6R2～0.8R2
L1＝0.45H～0.65H
L2＝0.3H～0.4H
wherein H is the height of the scraping ring matrix, and the value range of H is 0.3 mm-0.5 mm.
Example 1
The doctor blade ring dimensions used in example 1 were as follows: the height H of the blade ring is 0.3mm, the width T of the blade ring is 1.4mm, the radius R1 of the circular arc of the inner circular surface is 0.7H 0.21mm, the radius R2 of the circular arc of the outer circular surface is 0.25H 0.075mm, the length L1 of the upper transition inclined surface is 0.45H 0.135mm, the length L2 of the lower transition inclined surface is 0.3H 0.09mm, the included angle theta 1 between the upper transition inclined surface and the lower transition inclined surface is 30 degrees, and the height T1 of the arc of the blade ring is 0.6R2 0.045 mm.
Example 2
The doctor blade ring dimensions used in example 2 were as follows: the height H of the blade ring is 0.4mm, the width T of the blade ring is 2.65mm, the radius R1 of the inner circular arc is 0.875H and 0.21mm, the radius R2 of the outer circular arc is 0.375H and 0.15mm, the length L1 of the upper transition inclined plane is 0.55H and 0.22mm, the length L2 of the lower transition inclined plane is 0.35H and 0.14mm, the included angle θ 1 between the upper and lower transition inclined planes and the upper and lower surfaces is 37 °, and the height T1 of the outer circular arc of the blade ring is 0.67R2 and 0.10 mm.
Example 3
The doctor blade ring dimensions used in example 3 were as follows: the height H of the blade ring is 0.5mm, the width T of the blade ring is 3.8mm, the radius R1 of the inner circular arc is 0.9H 0.45mm, the radius R2 of the outer circular arc is 0.4H 0.2mm, the length L1 of the upper transition inclined plane is 0.65H 0.0.325mm, the length L2 of the lower transition inclined plane is 0.4H 0.2mm, the included angle θ 1 between the upper and lower transition inclined planes and the upper and lower surfaces is 45 °, and the height T1 of the outer circular arc of the blade ring is 0.8R2 is 0.16 mm.
Comparative example 1
Referring to fig. 4, a cross-sectional view of a scraper ring of a conventional oil ring is schematically shown, in which an inner circle side 12 and an outer circle side 13 of the scraper ring are semicircular, the radius of the semicircular shape is 0.5 times of that of the scraper ring of the conventional oil ring, the height of the conventional scraper ring is 0.3mm, the width of the conventional scraper ring is 1.6mm, the arc radius of the inner circle side is 0.15mm, and the arc radius of the outer circle side is 0.15 mm.
Comparative example 2
The inner circle side and the outer circle side of the traditional scraper ring of the comparative example are both semicircular, the radius of the semicircular shape is 0.5 times of that of the scraper ring of the traditional oil ring, the height of the traditional scraper ring is 0.4mm, the width of the traditional scraper ring is 1.75mm, the radius of the inner circle side arc is 0.2mm, and the radius of the outer circle side arc is 0.2 mm.
Comparative example 3
The inner circle side and the outer circle side of the traditional scraper ring of the comparative example are both semicircular, the radius of the semicircular shape is 0.5 times of that of the scraper ring of the traditional oil ring, the height of the traditional scraper ring is 0.5mm, the width of the traditional scraper ring is 2.5mm, the radius of the inner circle side arc is 0.25mm, and the radius of the outer circle side arc is 0.25 mm.
Experiment of
The blade ring of example 1 and the blade ring of comparative example 1 were placed on the same engine for a 400 hour bench test; the blade ring of example 2 and the blade ring of comparative example 2 were placed on the same engine for a 400 hour bench test; the blade ring of example 3 and the blade ring of comparative example 3 were subjected to a 400 hour bench test on the same engine, resulting in the following table 1:
TABLE 1
As can be seen from Table 1, the scraper ring has a remarkable effect on improving the oil consumption and the fuel consumption of an engine, and has great significance on reducing the abrasion of the ear part of the lining ring.
Specifically, the preparation method of the scraper ring comprises the following steps:
the method comprises the following steps: annealing and softening a round steel wire with the diameter phi of 3.2mm, grinding and peeling the surface, and removing defects such as pits, cracks and the like on the surface;
step two: then, the diameter of the steel wire is drawn to 2.0mm through multiple annealing and wire drawing processes;
step three: rolling after annealing and softening, namely rolling the round wire into a flat wire, and circulating for multiple times; until the height of the wire rod is controlled to be H +0.15mm and the width is controlled to be T +0.01 mm;
step four: roughly processing the inner circle and the outer circle, carrying out extrusion forming on the wire rod by utilizing a rolling roller, and reserving a margin of 0.015mm with the size of a finished product to obtain the wire rod of the oil ring scraper ring;
step five: after annealing, drawing and correcting by using a wire inner hole die of a finished product of the doctor blade ring, and after drawing, quenching and tempering to obtain the doctor blade ring wire;
step six: rounding the scraper ring by a ring winding machine according to the nominal diameter of the scraper ring, polishing, grinding and grinding the outer circle surface, and controlling the roughness Rz1.5 of the outer circle surface to be lower than;
step seven: utilize ultrasonic wave and hydrocarbon washing, get rid of greasy dirt and the impurity on doctor-bar surface, carry out surface treatment, the surface treatment mode has: nitriding, chromium plating, ceramic compounding, PVD coating, DLC coating and the like;
step eight: and after cutting, carrying out excircle grinding, polishing or honing treatment to enable the roughness Rz1.0 of the excircle surface of the scraper ring, thus obtaining the scraper ring.
Specifically, please refer to fig. 4, which is a schematic cross-sectional view of a wire rod of a doctor blade ring of an oil ring according to the present invention, wherein an included angle of 0.3 to 0.5 ° is formed between an upper horizontal surface 6 and a lower horizontal surface 7 of the wire rod, an inner side circular surface 8 of the wire rod is a large circular surface, a radius of the large circular surface is 0.7H to 0.9H, an outer side circular surface 9 of the wire rod is a small circular arc surface, a radius of the small circular arc surface is 0.2H to 0.4H, the outer side circular surface 9 is connected with the upper horizontal surface 6 and the lower horizontal surface 7 of the wire rod through an inclined surface, and a length of the inclined surface of the upper horizontal surface 6 is greater than a length of the inclined surface of the lower horizontal surface 7.
Specifically, referring to fig. 1-3, the sum of the widths of the scraping ring base 1, the inner circular arc 2 and the outer circular arc 3 is T, the range of T is 1.4mm to 3.8mm, the upper and lower bottom edges of the inner circular arc 2 and the scraping ring base 1 are connected through a transition circular arc surface, and the radius of the transition circular arc surface is 0.05mm to 0.015 mm; the included angle between the upper transition inclined plane 4 and the upper surface of the scraper ring is theta 1, the included angle between the lower transition inclined plane 5 and the lower surface of the scraper ring is theta 2, and the value ranges of theta 1 and theta 2 are 30-45 degrees; the outer circular arc 3 and the surface of the transition inclined plane are provided with wear-resistant coatings, and the wear-resistant coatings are one or a combination of a nitride layer, a chromium coating, a ceramic composite coating and a diamond-like carbon coating.
Specifically, referring to fig. 5 and 6, the main stresses in the working process of the scraper ring 15 are as follows: the expanding force of the liner ring 14 on the inner circular surface of the doctor blade ring 15 is marked as F1 (the force is applied in the horizontal direction, the force-bearing surface is the stress of the liner ring ear and the inner circular surface of the doctor blade R1), the direction restraining force of the inner wall of the cylinder sleeve 17 on the outer circular surface of the doctor blade ring 15 is marked as F2 (the force is applied in the horizontal direction, the force-bearing surface is the arc radius R2 of the outer circular surface of the doctor blade and the inner wall of the cylinder sleeve), and the two forces of F1 and F2 are almost equal and opposite in direction. In addition, the oil ring moves up and down along with the piston, and the outer circular surface of the scraper ring generates sliding friction force with the inner wall of the cylinder sleeve 17, which is marked as F3. The radius R1 of the inner circular surface arc 2 of the scraper ring is larger than that of the inner circular surface arc of the common scraper ring, so that the contact surface between the inner circular surface of the scraper ring and the backing ring 14 is increased, and the radius R2 of the outer circular surface arc 3 of the scraper ring is smaller than that of the outer circular surface arc of the common scraper ring, so that the contact surface between the outer circular surface of the scraper ring and the inner wall of the cylinder sleeve is reduced. Therefore, under the same expansion force of the liner ring 14, the pressure intensity per unit area of the contact surface between the inner circular surface of the scraper ring and the liner ring 14 is far smaller than that of the common scraper ring, and the pressure intensity per unit area of the contact surface between the outer circular surface of the scraper ring and the cylinder sleeve is far larger than that of the common scraper ring. The pressure intensity of the unit area of the contact surface of the inner circle surface of the scraping ring 15 and the lining ring 14 is a main factor causing the ear part abrasion of the lining ring 14, the abrasion is increased as the pressure intensity is larger, the pressure intensity of the unit area of the contact surface of the outer circle surface of the scraping ring 15 and the cylinder sleeve 17 is a favorable factor for oil scraping, and the oil scraping effect is better as the pressure intensity is larger. Therefore, the invention effectively improves the abrasion of the inner circle surface of the scraping blade to the ear part of the lining ring 14, improves the oil scraping effect and reduces the oil consumption. In addition, the larger the sliding friction force F3 is, the larger the friction loss of the engine is, and under the condition that F2 is fixed, F3 is in direct proportion to the contact surface of the blade ring 15 and the cylinder sleeve 17, and the smaller the contact surface is, the corresponding reduction of F3 is realized.
When the scraper ring is used, as shown in fig. 4, the upper scraper ring 15, the lower scraper ring 15 and the middle liner ring 14 are combined together and placed in the oil ring groove of the piston 16.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.
Claims (8)
1. A doctor blade ring, comprising: the scraper ring base body (1) is parallel to the upper surface and the lower surface; an inner circular arc (2) extends from the annular inner side of the scraper ring base body (1), and the radius of the inner circular arc is R1; an outer circular arc (3) extends from the annular outer side of the scraper ring base body (1), the radius of the outer circular arc is R2, and the arc width of the outer circular arc is t 1; the outer circular arc is connected with the upper surface and the lower surface of the scraper ring base body (1) through transition inclined planes, the length of an upper transition inclined plane (4) connected with the upper surface is L1, and the length of a lower transition inclined plane (5) connected with the lower surface is L2; has the following relation:
R1＝0.7H～0.9H
R2＝0.25H～0.4H
t1＝0.6R2～0.8R2
L1＝0.45H～0.65H
L2＝0.3H～0.4H
wherein H is the height of the scraping ring matrix, and the value range of H is 0.3 mm-0.5 mm.
2. Doctor blade ring according to claim 1, characterized in that the sum of the width of the doctor blade ring base (1) and the inner circular arcs (2) and the outer circular arcs (3) is T, T ranging from 1.4mm to 3.8 mm.
3. Doctor blade ring according to claim 1, characterized in that the inner circular arc (2) is connected to the upper and lower base edges of the doctor blade ring base (1) by a transition arc, the radius of which is 0.05mm to 0.015 mm.
4. The doctor blade ring as claimed in claim 1, wherein the angle between the upper transition slope (4) and the upper surface is θ 1, the angle between the lower transition slope (5) and the lower surface is θ 2, and θ 1 and θ 2 are in the range of 30 ° to 45 °.
5. Doctor blade ring according to claim 1, characterised in that the outer circular arc (3) and the transition bevel surface are provided with a wear-resistant coating.
6. A doctor blade ring as claimed in claim 5, characterised in that the wear resistant coating is one or a combination of a nitride layer, a chromium coating, a ceramic composite coating, a diamond-like coating.
7. A three-combination piston oil ring, comprising: a bushing ring (14), and a doctor blade ring (15) according to claims 1-6 arranged on the upper and lower surfaces of the bushing ring.
8. A method of making a doctor blade ring as claimed in any one of claims 1 to 6, comprising the steps of:
s1: performing surface treatment on the round steel wire and then drawing the diameter of the steel wire;
s2: rolling the drawn round wire into a flat wire according to the size of the doctor blade ring to be produced;
s3: roughly processing the inner circle and the outer circle of the flat wire, and extruding the flat wire into an inner circular arc and an outer circular arc by using a pair of rollers;
s4: drawing and correcting the flat wires with arc inner and outer circular surfaces and an inner hole die of a finished product of the scraper ring wire rod to obtain the wire rod of the scraper ring;
s5: rounding the piston ring by a ring winding machine according to the nominal diameter of the piston ring, and polishing and grinding the outer circle surface to enable the roughness Rz1.5 to be within;
s6: after removing oil stains and impurities on the surface of the scraping sheet, cutting off the scraping sheet ring which is encircled by the encircling machine, and polishing and grinding the surface of the outer circle to enable the roughness Rz1.0 of the outer circle surface to obtain a finished product of the scraping sheet ring.
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| CN202010995854.3A CN112178186B (en) | 2020-09-21 | 2020-09-21 | Doctor blade ring, three-combination piston oil ring and preparation method of doctor blade ring |
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| CN112178186B true CN112178186B (en) | 2022-06-17 |
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| EP4303425A4 (en) * | 2021-03-31 | 2024-07-24 | Kabushiki Kaisha Riken | SIDE TRIM AND OIL SCRAPER RING |
| CN114178436A (en) * | 2021-11-10 | 2022-03-15 | 安庆帝伯格茨活塞环有限公司 | Method for processing diesel engine ring and forming equipment thereof |
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| JP6195949B2 (en) * | 2016-02-26 | 2017-09-13 | 株式会社リケン | piston ring |
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